What kind of helmet is this?

Article about: hello experts I want to question you which helmet this is It is made from vulcanfiber and have 4 bolts, no stamps and is very damaged I hope someone can tell me more about it first i thinked

What kind of helmet is this?

hello experts
I want to question you which helmet this is
It is made from vulcanfiber and have 4 bolts, no stamps and is very damaged
I hope someone can tell me more about it
first i thinked it was a DDR helmet ,but there is no perfect and size stamp visible
Regards
Bavarian